Large enterprise clients began refusing to deploy ZMM220s unless the manufacturer addressed the default password risk. In response, the OEM issued a mandatory firmware update (version and later) that enforces new Telnet security policies.
Answer & question – Official website of ZKTeco | Biometric security systems zmm220 default telnet password updated
To enhance device security and align with updated security policies, the default Telnet password for the ZMM220 has been changed. Devices running firmware version [insert version] or later will no longer accept the previous default credential. Large enterprise clients began refusing to deploy ZMM220s
The update to the default Telnet password was made to address potential security vulnerabilities associated with the previous password. In the past, the default password was relatively simple and easily guessable, which could have allowed unauthorized users to gain access to the device. By updating the password, the manufacturer has taken a proactive approach to preventing potential security breaches and protecting user data. Devices running firmware version [insert version] or later
: If remote management via Telnet is not required, it should be disabled in the system settings to close port 23 entirely.
In older firmware versions, the most common login combination was: root Password: solars or zkem_p 2. The "Updated" Reality